Florian Müllner authored Feb 12, 2019 and Georges Basile Stavracas Neto committed Mar 21, 2019

The current scripting module makes heavy use of pre-standardized
iterator/generator/promise APIs, at least for some of those support
was pulled in SpiderMonkey 58.

Port to the new standardized replacements to get the module back into
a working state.

!440